About Shinki’s bug from Mystic Square
A lot of you know about the glitch from Mystic Square where you can apparently die for no reason at the beginning of Shinki’s fight.
You don’t have to be perfectly aligned with her in order to die.
In case you haven’t seen this post on reddit reddit.com/r/touhou/comments/8p4v7p/the_cause_of_shinki_glitch_has_been_found/, some people managed to find the cause of this occurence.
Apparently, if you kill Yuki and Mai during the “cheeto” phase, the cheetos that were on screen at the moment of their defeat will respawn at beginning of Shinki’s fight. However, they will be invisible, so you won’t be able to see them, you will just die suddenly.
Here is one video (amongst others linked on that thread) that show clearly the correlation between them.